Parametric study in embedded PyMechanical

### 📝 Description of the example

This examples uses the Valve example and adds a parametric study (several pressure values).
This was built to illustrate how to run a parametric analysis in embedded mode.

### 📁 Files needed for running the example

[valve_parametric.py](https://github.com/user-attachments/files/27950942/valve_parametric.py)

### 💻 Which operating system are you using?

Windows

### 📀 Which ANSYS version are you using?

26.1

### 🐍 Which Python version are you using?

3.12

### 📦 Installed packages

```shell
Not relevant
```

Start by reading the attached valve_parametric.py and the repository's existing Valve example to understand where examples are kept and how embedded mode is demonstrated. Add the parametric-study example using several pressure values, and verify that the example clearly illustrates running a parametric analysis in embedded mode.

Written by the indexing model from the issue text.